1393427779 has 2 divisors, whose sum is σ = 1393427780. Its totient is φ = 1393427778.

The previous prime is 1393427767. The next prime is 1393427809. The reversal of 1393427779 is 9777243931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1393427779 - 2¹⁵ = 1393395011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1393427479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696713889 + 696713890.

It is an arithmetic number, because the mean of its divisors is an integer number (696713890).

Almost surely, 2^1393427779 is an apocalyptic number.

1393427779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393427779 is an equidigital number, since it uses as much as digits as its factorization.

1393427779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000376, while the sum is 52.

The square root of 1393427779 is about 37328.6455553908. The cubic root of 1393427779 is about 1116.9356549392.

The spelling of 1393427779 in words is "one billion, three hundred ninety-three million, four hundred twenty-seven thousand, seven hundred seventy-nine".